It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Holy Prophet (peace and blessings be upon him) said: Five prayers and one Friday to the next Friday are expiation for the sins committed in between, provided that major sins are avoided.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 8715
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد حسن، م: 233